CVE-2022-33140: Apache NiFi, Apache NiFi Registry: Improper Neutralization of Command Elements in Shell User Group Provider

[David Handermann <exceptionfactory () apache org>]

Severity: high

Description:

The optional ShellUserGroupProvider in Apache NiFi 1.10.0 to 1.16.2 and Apache NiFi Registry 0.6.0 to 1.16.2 does not 
neutralize arguments for group resolution commands, allowing injection of operating system commands on Linux and macOS 
platforms.

The ShellUserGroupProvider is not included in the default configuration. Command injection requires 
ShellUserGroupProvider to be one of the enabled User Group Providers in the Authorizers configuration. Command 
injection also requires an authenticated user with elevated privileges.  Apache NiFi requires an authenticated user 
with authorization to modify access policies in order to execute the command. Apache NiFi Registry requires an 
authenticated user with authorization to read user groups in order to execute the command.

The resolution removes command formatting based on user-provided arguments.

This issue is being tracked as NIFI-10114

Mitigation:

Disabling the ShellUserGroupProvider mitigates the vulnerability.